Kid Fail Reg Flashcards
Homeostatic kidney function
Electrolyte balance
Acid base balance
Volume homeostasis
Kidney endocrine function
Erythropoietin
1 alpha-hydroxylase vitamin D
Kidney excretory function
Nitrogenous waste Hormones Peptides Middle sized molecules Salt and water
Kidney glucose metabolism
Gluconeogenesis
Insulin clearance
Kidney failure homeostatic
Increased potassium Decreased bicarbonate Decreased pH Increased phosphate Salt and water imbalance
Kidney failure endocrine
Decreased calcium
Anaemia
Increased parathyroid hormone
Kidney failure excretory
Increased urea
Increased creatinine
Decreased insulin requirement
Kidney failure plasma CO2
Decreased
Kidney failure plasma O2
Increased
Kidney failure base excess
Decreased
Kidney failure and salt and water secretion
Reduced
Leading to hypertension, oedema and pulmonary oedema
May also be seen in tubulointerstitial disorders - damage to concentration mechanism and hypovolemia may be the cause of AKI
Kidney failure acidosis
Reduce excretion of hydrogen ions
Retention of acid bases
Leading to anorexia and muscle catabolism
Kidney failure hyperkalaemia
Due to acidosis, hydrogen ions go into cell which forces potassium out, but not getting rid of potassium
Decreased distal tubule potassium secretion
Symptoms of hyperkalaemia kidney failure
Depend on chronicity
Cardiac arrhythmias
Neutral and muscular activity
Vomiting
Kidney failure hyperkalaemia ECG
Peaked T waves P wave broaden - reduced amplitude - disappear QRS widening Heart block Asystole VT/VF
Reduced 1-25 vitamin d levels
Reduced intestinal calcium absorption
Hypocalcaemia
Hyperparathyroidism
Additional cardiovascular risks
Inflammation
Oxidative stress
Mineral/bone metabolism disorder
Kidney failure initial management
Fluid balance and hyperkalaemia management
Fluid balance
Hypovolaemic - give fluids
Hypervolaemic - trial of diuretics/dialysis
Hyperkalaemia management
Drive into cells - sodium bicarbonate and insulin dextrose
Drive out of the body - diuretics/dialysis
Gut absorption - potassium binders
Long term conservative management
Erythropoietin injections to correct anaemia
Diuretics to correct salt water overload
Phosphate binders
1-25 vitamin d supplements
Symptoms management
Assessment urea
Poor indicator
Confound by diet, catabolic state, GI bleeding
Assessment creatinine
Affected by muscle mass, ace, race, sex
Trend helpful
Assessment radionuclide studies
EDTA clearance
Reliable but expensive
Assessment creatinine clearance
Difficult for elderly to collect an accurate sample
Overestimates GFR at low GFR as small amount of creatinine is also secreted into urine
Assessment insulin clearance
Laborious - research only